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Method for gold deposition

a deposition method and gold technology, applied in the field of gold deposition, can solve the problems of limited signal-to-noise ratio, silver deposition may occur, and the deposition is not completely complete, so as to reduce the deposition rate, increase the deposition rate, and reduce the gold deposition rate

Inactive Publication Date: 2004-02-19
BRAUN EREZ +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

"The present invention provides a method for depositing gold onto specific sites on a substrate using a gold-providing agent and a nucleation center. The nucleation center acts as a catalyst for the transformation of the gold-providing agent into gold metal, which is then deposited onto the substrate. The method is controlled by the incubation time and other conditions affecting the gold deposition, resulting in the deposition of gold metal at the nucleation centers. The nucleation centers can be formed by chemical or physical deposition of nucleation center forming agents onto the sites. The treatment composition is typically an aqueous solution containing a gold complex and a reducing agent. The technical effect of the invention is the ability to deposit gold onto specific sites on a substrate with control over the deposition rate."

Problems solved by technology

However, one typical drawback of silver deposition is that the deposition is not completely specific and some degree of spontaneous deposition of silver may occur also without an a priori deposition of nucleation centers.
Thus, where silver deposition is used in image-enhancement or contrast-enhancement methods, there is typically a limited signal-to-noise ratio.

Method used

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Examples

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Embodiment Construction

[0057] Preparation of a Treatment Composition and General Gold Deposition Scheme

[0058] A treatment composition in accordance with the preferred embodiment of the invention comprises a gold-containing complex-Au.sup.1SCN.sup.-. In order to prepare such a treatment composition at a first stage a solution comprising KAu.sup.IIICl.sub.4 and KSCN is prepared, typically by mixing two stock solutions, one comprising the gold containing complex and the other the KSCN. For example, such a solution may be formed by mixing equal volumes of a first solution comprising about 0.5 M KSCN and a second solution comprising about 0.05 M KAumCl.sub.4. Such mixing results in the formation of the complex KAu.sup.III(SCN).sub.4 (See Scheme (a) in FIG. 1). This complex precipitates but spontaneously forms the complex KAu.sup.I(SCN).sub.2. Typically, after the KAu.sub.III(SCN).sub.4 is precipitated, it is washed and resuspended in water or buffer and allowed to undergo the spontaneous reaction (SPONT.) note...

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Abstract

A method for depositing gold on a substrate is provided. By this aspect, nucleation centers are bound, deposited or formed at one or more sites on the substrate, the substrate is then contacted with a treatment composition which comprises soluble gold-providing agent from which gold is deposited onto a nucleation center to yield gold metal deposits. The method of the invention may be used for a variety of image enhancing techniques as well as diagnostic and analyte detection techniques.

Description

[0001] The invention relates to chemical deposition of gold metal on substrates.[0002] There are various techniques and uses in which metal substances are deposited on substrates. In various such methods, the metal to be deposited is provided in a form of a soluble complex or molecule, e.g. in an aqueous solution. Under appropriate conditions the complex or molecule is reduced and deposits the metal onto the substrate.[0003] At times, in order to ensure deposition of metal from solution onto a substrate, it is preferable to first provide nucleation centers on the substrate. Such nucleation centers may, for example, be a variety of metal complexes, clusters or small metal particles, deposited on or attached to the surface.[0004] Examples of techniques involving metal deposition are a variety of image formation or latent image contrast-enhancement techniques for photography, optical microscopy or electron microscopy. Another example of laboratory techniques where metal complexes are d...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12N15/09C12Q1/68G01N33/53G01N1/30G01N33/543G01N33/566G01N33/58
CPCC12Q1/6834G01N1/30G01N33/5438G01N33/585C12Q2527/127
Inventor BRAUN, EREZEICHEN, YOAVSIVAN, URI S.
Owner BRAUN EREZ
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